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On perturbations of the spectrum of unitary operators

โœ Scribed by N. K. Nikol'skii


Publisher
SP MAIK Nauka/Interperiodica
Year
1969
Tongue
English
Weight
315 KB
Volume
5
Category
Article
ISSN
0001-4346

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Unitary transformations with the unitary
โœ N. F. Stepanov ๐Ÿ“‚ Article ๐Ÿ“… 1981 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 478 KB

## Abstract Unitary transformations of operators and variables are considered for those cases when a Hermitian operator in the expression **U** = exp (__i__**S**) explicitly depends on the projection operators. Some simple examples of such transformations are given and the equations obtained which